#include <stdio.h>

#define R 6371
#define PI 3.14
#define V PI * R * R * R * 4 /3

int main(void)
{
	/*
	int r;
	float s;
	
	printf("请输入圆的半径：");
	scanf("%d",&r);
//#undef PI
	s = PI * r * r;
	printf("圆的面积是：%.2f\n",s);
	*/

	printf("地球的体积大概是：%.2f\n",V);

	return 0;
}
